 /*******************************************************************************
  * Copyright (c) 2000, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal;

 public class ContainerPlaceholder extends PartPlaceholder implements
         ILayoutContainer {
     private static int nextId = 0;

     private ILayoutContainer realContainer;

     /**
      * ContainerPlaceholder constructor comment.
      * @param id java.lang.String
      * @param label java.lang.String
      */
     public ContainerPlaceholder(String id) {
         super(((id == null) ? "Container Placeholder " + nextId++ : id)); //$NON-NLS-1$
 }

     /**
      * add method comment.
      */
     public void add(LayoutPart child) {
         if (!(child instanceof PartPlaceholder)) {
             return;
         }
         realContainer.add(child);
     }

     /**
      * See ILayoutContainer::allowBorder
      */
     public boolean allowsBorder() {
         return true;
     }

     /**
      * getChildren method comment.
      */
     public LayoutPart[] getChildren() {
         return realContainer.getChildren();
     }

     /**
      * getFocus method comment.
      */
     public LayoutPart getFocus() {
         return null;
     }

     /**
      * getFocus method comment.
      */
     public LayoutPart getRealContainer() {
         return (LayoutPart) realContainer;
     }

     /**
      * isChildVisible method comment.
      */
     public boolean isChildVisible(LayoutPart child) {
         return false;
     }

     /**
      * remove method comment.
      */
     public void remove(LayoutPart child) {
         if (!(child instanceof PartPlaceholder)) {
             return;
         }
         realContainer.remove(child);
     }

     /**
      * replace method comment.
      */
     public void replace(LayoutPart oldChild, LayoutPart newChild) {
         if (!(oldChild instanceof PartPlaceholder)
                 && !(newChild instanceof PartPlaceholder)) {
             return;
         }
         realContainer.replace(oldChild, newChild);
     }

     /**
      * setChildVisible method comment.
      */
     public void setChildVisible(LayoutPart child, boolean visible) {
     }

     /**
      * setFocus method comment.
      */
     public void setFocus(LayoutPart child) {
     }

     public void setRealContainer(ILayoutContainer container) {

         if (container == null) {
             // set the parent container of the children back to the real container
 if (realContainer != null) {
                 LayoutPart[] children = realContainer.getChildren();
                 if (children != null) {
                     for (int i = 0, length = children.length; i < length; i++) {
                         children[i].setContainer(realContainer);
                     }
                 }
             }
         } else {
             // replace the real container with this place holder
 LayoutPart[] children = container.getChildren();
             if (children != null) {
                 for (int i = 0, length = children.length; i < length; i++) {
                     children[i].setContainer(this);
                 }
             }
         }

         this.realContainer = container;
     }

     public void findSashes(LayoutPart part, PartPane.Sashes sashes) {
         ILayoutContainer container = getContainer();

         if (container != null) {
             container.findSashes(this, sashes);
         }
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.ILayoutContainer#allowsAutoFocus()
      */
     public boolean allowsAutoFocus() {
         return false;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.ILayoutContainer#isZoomed(org.eclipse.ui.internal.LayoutPart)
      */
     public boolean childIsZoomed(LayoutPart toTest) {
         return false;
     }
 }

